论文部分内容阅读
采用供硅处理与否的溶液培养水稻作供试材料,研究了硅在新嫩组织中的含量、分布、形态分组和动态变化及其与稻瘟病抗性的关系。结果表明,水稻组织硅质化在展叶( 或出穗) 前即已开始,在稻瘟病菌入侵的关键时期———展叶( 或出穗) 后最初几天,供硅与否其组织硅质化状况已存在悬殊差异。前者新嫩叶片SiO2 含量达5-45 % ,难溶性硅占全硅量94-5 % ;后者新嫩叶片SiO2 含量仅为1-20 % ,难溶性硅占全硅量只78-33 % 。供硅的新嫩叶片表面已有明显亚铃状硅化细胞出现,乳突粗大,X射线硅的能谱分析线在硅化细胞和乳突处出现较高的峰,表明该处硅的分布密度较高。而未经供硅处理的对照此时新嫩叶片表面未见明显硅化细胞,乳突小,X射线硅的能谱分析线为无曲折变化的平滑直线。供硅与否水稻新嫩组织间上述差异是导致日后稻瘟病发病率明显不同的基础。试验还表明,无论供硅与否,水稻体内可溶性硅含量始终维持在0-3 % 左右,表明这可能是稻体组织内由可溶性硅转化为难溶性硅的一个阈值。
The silicon content in the new tissue was studied by using the culture solution-fed rice as the experimental material. The content, distribution, morphological grouping and dynamics of the silicon in the new tissue were studied, and their relationship with the blast resistance was also studied. The results showed that the silicetization of rice tissue began before leaf expansion (or panicle emergence). At the critical period of rice blast invasion-the first few days after leaf expansion (or panicle emergence) Silicification of the situation there are disparities. The former new leaves of SiO2 content of 5-45%, insoluble silicon accounted for 94-5% of the total silicon; the latter new leaves SiO2 content of only 1-20%, insoluble silicon accounted for only 78-33% of the total silicon, . Obviously, the appearance of sub-bellied silicified cells appeared on the surface of the new leaves for silicon, and the mastoid was thick. The energy spectrum of X-ray silicon showed a higher peak at the silicified cells and mastoid, indicating that the distribution density of silicon Higher. The control without silicon treatment at this time on the surface of the new tender leaves no obvious silicified cells, papillae small, X ray X-ray spectroscopy analysis of the straight line without change in the smooth curve. The difference between the new and tender tissues for silicon or not is the basis for the significantly different incidence of blast in the future. The experiment also showed that the content of soluble silicon in rice maintained at 0-3% regardless of silicon supply or not, suggesting that this may be a threshold value for the conversion of soluble silicon to insoluble silicon in rice tissues.